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Computer Science MCQs

Computer science and IT MCQs for competitive and job exams.

Popular Computer Science questions

Computer Science · Programming & Databases

ANullableBDuplicateCUnique and not nullDAuto-increment only

Why? A primary key uniquely identifies each row and cannot contain NULL.

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Medium · Computer ScienceOpen details

Computer Science · Programming & Databases

AUNIQUEBDISTINCTCLOOPDONLY

Why? SELECT DISTINCT eliminates duplicate rows from the result set.

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Easy · Computer ScienceOpen details

Computer Science · Programming & Databases

ASELECTBWHERECORDER BYDGROUP BY

Why? The WHERE clause filters rows before grouping or ordering.

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Hard · Computer ScienceOpen details